//method that validates the user input
private bool ValidateInputs()
{
//if number feild is empty
if (string.IsNullOrEmpty(TableNumber.Text))
{
//message box display the error
MessageBox.Show("Table number Empty! Please enter again!");
TableNumber.Focus();
return(false);
}
//check for numeric number
try
{
int num = Convert.ToInt32(TableNumber.Text);
}
catch (Exception ex)
{
//message box display the error
MessageBox.Show("Wrong Input! Number must be a numeric value.");
TableNumber.SelectAll();
return(false);
}
//check if waiter name is empty
if (string.IsNullOrEmpty(WaiterName.Text))
{
//message box display the error
MessageBox.Show("Waiter name is empty! Please enter waiter's name.");
WaiterName.Focus();
return(false);
}
return(true);
}
//method that perform ok button function from main window
private void okButton_Click(object sender, RoutedEventArgs e)
{
//check for valid input from user
if (ValidateInputs())
{
//create a new list for bills
TableBill bill = new TableBill();
bill.Table_Number = Convert.ToInt32(TableNumber.Text);
bill.Waiter_Name = WaiterName.Text;
bills.Add(bill);
MenuWindow menuWindow = new MenuWindow();
menuWindow.Tag = bill;
this.Hide();
menuWindow.ShowDialog();
// Clear input fields
TableNumber.Clear();
WaiterName.Clear();
TableNumber.Focus();
//main windnow
this.ShowDialog();
}
}
